Malicious PDF — malware analysis report

Static analysis result for SHA-256 6146ab964b98b9df…

MALICIOUS

PDF

73.4 KB Created: 2021-09-01 05:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c5e80764bb237eac158743c0ab7f24ab SHA-1: 291ce7038abba9a2fd21ef5bc2d02d4190e56272 SHA-256: 6146ab964b98b9df8878b6248af77e1bc2993bd90706d9e1d6114cf5771a7756
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to other PDF files hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://colakcivi.com/userfiles/file/giporowexamobuluzu.pdf In PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/45541131954.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/29487709530.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/1978612536.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160afd81072944---69209616250.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/rafawizisikekat.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/99033956685.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9be2ea8156---31480515555.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/pivuxov.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/15359468725.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/71026447116.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/69318452556.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/33978280138.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/wedifow.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/87171059538.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/sj3rqdnju9dcq74i8ma4rhsoi1/fagikevigili.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/74de27703dbbe3dd9e665ca3b9da931d/masavulavikuzisuwokowi.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/24819824114.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6cc9dcfe2---92995293333.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/d332b52e46a08f1956252248acbff408/18227461910.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/161290a5a9d5fa---tizegoroxarivizutimifi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/85c35h72dgh41iijubvs3por27/ditotaxubadefunagut.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/233g173oifrcekvpplhk59as3s/14236131433.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/7f31de169ea0015fbd1fb4bdd7706eab/15448177666.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=anthem+of+the+heart+full+movie+eng+subPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E1 16652 bytes
SHA-256: 9fe8354599289e3a9536dddc94b6e4577e513a6d9355c78a7a2baa212a3ceb35
font_01_sfnt_off0000ebe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 10948 bytes
SHA-256: 9bfded2a7e782a9ac2acf0a23332cde8d7ec13bbf1b4bf879dac1057377df895
font_02_sfnt_off00010519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10519 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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